TOMEI POWERED 280

Camshafts Mitsubishi 4G63 EVO
TOMEI POWERED 280

DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

MANUFACTURER: TOMEI POWERED
ENGINE MODEL: 4G63 EVO 8
CAMSHAFT PN# (INTAKE): 1453280115
CAMSHAFT PN# (EXHAUST):1455280115
SPEC CARD# : GSC-6008S3

INTAKE EXHAUST
CAM TIMING EVENTS
Centerline 110° 115°
Valve Opening @ 1.0mm 1.0° ATDC 56.4° BBDC
Valve Opening @ 0.050″ 2.5° ATDC 52.6° BBDC
Valve Closing @ 1.0mm 51.4° ABDC 4.0° BTDC
Valve Closing @ 0.050″ 47.5° ABDC 7.6° BTDC
DURATION
Actual Duration @ 1.0mm 232.4° 232.4°
Actual Duration @ 0.050″ 225.0° 225.1°
Claimed Duration @ 1.0mm 233.5° 232.5°
PEAK LIFT
Peak Valve Lift 11.5mm (0.454″) 11.5mm (0.451″)
Peak Cam Lift 6.7mm (0.263″) 6.6mm (0.261″)

Manufacturer’s Pitch

TOMEI has released a wide range of camshafts for the 4G63 to suit various users’ needs. The PROCAM 280-11.5 is for the serious users who need results when every milli-second counts. These will deliver the added power and are made for increased performance from mid to high end RPM. Not for the faint hearted and will require professional setup and installation.

INFO

Stepping up from the 272 pack, the TOMEI 280 camshaft set offers an extremely high lift of 11.5mm and peak power at 8,400 RPM. Maximum horsepower checked in right above the 590 figure, resulting in a 30 percent increase over the factory cams. This set of high-duration, high-lift camshafts also induced a very lopey idle. From 5,000 to 8,500 RPM, the TOMEI 280s delivered a significant increase in power. Compared to the TOMEI 270s, these 280s trade low-end power below 5,000 RPM for peak power near redline. This set of Tomei camshafts requires upgraded valve springs.

RUNDOWN

DSPORT Magazine technical showcase editorial on EVO 4G63 camshaft optionsDSPORT Magazine technical showcase editorial on EVO 4G63 camshaft options

591.60 WHP @ 8,400 RPM
417.13 LB-FT @ 6,600 RPM

Peak power checked in at 8,400 RPM, with the power curve remaining flat all the way to redline. Peak boost was reached at about 4,600 RPM. A flat torque band from 5,000 to 8,000 RPM delivered a peak torque figure of just over 415 lb-ft. Peak torque was achieved at 6,600 RPM. The highest VE values were recorded between 6,000 and 6,500 RPM. VE figures registered higher than the factory units from 4,000 RPM to the top.

HORSEPOWER
RPM/WHP FACTORY TOMEI 280 GAIN/(LOSS)
2500 49.66 46.36 (3.30)
3000 82.45 60.34 (22.11)
3500 112.31 85.96 (26.35)
4000 166.27 132.14 (34.13)
4500 281.42 236.23 (45.19)
5000 323.28 350.85 27.57
5500 371.95 421.84 49.89
6000 399.03 470.43 71.40
6500 415.72 504.75 89.03
7000 451.50 546.13 94.63
7500 N/A 574.69 N/A
8000 N/A 576.29 N/A
8500 N/A 590.45 N/A

VOLUMETRIC EFFICIENCY
RPM/% FACTORY VE TOMEI 280
2500 80.5 87.6
3000 88.2 93.0
3500 98.6 96.7
4000 85.9 96.0
4500 85.0 97.8
5000 89.1 97.2
5500 92.1 97.8
6000 88.7 99.0
6500 88.8 99.8
7000 84.9 96.8
7500 N/A 92.2
8000 N/A 90.2
8500 N/A 84.4
4G63CamshaftCT9AEVO VIIIMitsubishi